Growth and characterization of Na3R(BO3)2 (R = La-Gd) borates: crystal structure, high-temperature behavior, and optical properties
Na3R(BO3)2 (R = La-Gd) borates, grown with Na2O-B2O3-NaF flux, crystallize in the space group P21/n. Contrary to previously published data, the peaks in the 980(La)-950(Gd) °C range are attributed to phase transition process, while the melting process occurs at about 100° higher. Another feature of...
| Опубликовано в: : | CrystEngComm Vol. 25, № 19. P. 2914-2924 |
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| Другие авторы: | , , , , , , , , , |
| Формат: | Статья в журнале |
| Язык: | English |
| Предметы: | |
| Online-ссылка: | http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001133153 Перейти в каталог НБ ТГУ |
| Итог: | Na3R(BO3)2 (R = La-Gd) borates, grown with Na2O-B2O3-NaF flux, crystallize in the space group P21/n. Contrary to previously published data, the peaks in the 980(La)-950(Gd) °C range are attributed to phase transition process, while the melting process occurs at about 100° higher. Another feature of thermal behavior consists of the gradual decomposition of the compound into Na3R2(BO3)3. The end member in the decomposition series is Na2R2O(BO3)2, which originates under oxygen/water atmosphere. In addition, the components of the thermal expansion tensor and the dependings of the unit-cell parameters of Na3-Nd(BO3)2 on temperature were defined. A series of Pr3+, Nd3+, and Sm3+-doped Na3Gd(BO3)2 (NGB) borates were prepared from mixtures of grown crystals by solid-state synthesis, and their photoluminescence properties were studied in detail. The excitation and emission spectra of NGB: Pr3+ and NGB: Nd3+ are comparable with similar compounds, and the relative intensity reaches the maximum at 1 mol% of Pr3+, Sm3+, and 10 mol.% for Nd3+ doping. |
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| ISSN: | 1466-8033 |